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The most striking plot, however, from Dorigo’s post, was not in Renton’s talk. It comes from Heinemeyer et al, and the theoretical analysis behind it is explained here.

The red band, corresponding to the Standard Model, comes from varying the only free parameter in the model, mHm_H, from the LEP exclusion bound, mH>114m_H\gt 114 GeV, up to mH=400m_H=400 GeV. The green band corresponds to the unconstrained MSSM. The upper edge corresponds to the region where mt˜2/mt˜1m_{\tilde{t}_2}/m_{\tilde{t}_1} and/or mb˜2/mb˜1>2.5m_{\tilde{b}_2}/m_{\tilde{b}_1}\gt 2.5. The lower edge corresponds to the decoupling limit, where all the superpartners are heavy.

The Tevatron seems to mildly favour the MSSM over the SM.

While precision electroweak fits are nice, direct search results are nicer. Via Matt Reece, comes news that D0 has excluded (ppt), at 2σ\sigma, mHm_H in a narrow range centered at 170 GeV. There’s also a summary of the combined CDF/D0 limits on mH>155m_H\gt 155 GeV.

1 We work in the convention that mf˜2/mf˜1≥1m_{\tilde{f}_2}/m_{\tilde{f}_1}\geq 1

Posted by distler at July 31, 2008 4:34 PM

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